Analog Devices Linear Technology DC2432B Guida rapida alla configurazione

dc2432bfb

DEMO MANUAL DC2432B

DESCRIPTION

LT6658

Precision Dual Output, High Current,

Low Noise, Voltage Reference

Demonstrationcircuit2432BfeaturestheLT

6658,apreci-

sion dual output reference that combines the performance

of a low drift low noise reference and a linear regulator.

Demonstrationcircuitsareavailablewith1.25V,2.5V,3.0V,

3.3V, 4.096V and 5V output option parts. Both outputs

are ideal for driving the precision reference inputs of high

resolution ADCs and DACs, even with heavy loading while

simultaneouslyactingasoutputsuppliesforpoweringmi-

crocontrollersand other supporting devices. Both outputs

have the same precision specifications and track each L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Refulator is a trademark of Analog Devices, Inc. All other trademarks are the property of their

respective owners.

PERFORMANCE SUMMARY

LT6658 BLOCK DIAGRAM

other over temperature. Each output can be configured

with external resistors to give an output voltage up to 6V.

Using Kelvin connections, the LT6658 typically has

0.1ppm/mA load regulation with up to 150mA load

current. A noise reduction pin is available to band-limit

and lower the total integrated noise.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2432B

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 5V 36 V

VOUT Output Voltage Accuracy –0.05 +0.05 %

Temperature Drift 10 ppm

IQSupply Current 2 mA

Load Regulation OUT1 0mA to 150mA 2 µV/mA

Load Regulation OUT2 0mA to 50mA 3.75 µV/mA

THERMAL

SHUTDOWN

DNC

GND

IN2

IN1

OUT2_F

OUT1_F

OUT2_S

OUT1_S

BYPASS

DC2432 BD

BANDGAP

BUFFER 2

BUFFER 1

Voltage Option

(V)

(Ω)

R3, R4

(Ω)

1.2 400 9600 768

1.8 400 2903 705

2.5 400 OPEN 800

3 400 OPEN 800

3.3 400 OPEN 800

5 400 OPEN 800

dc2432bfb

DEMO MANUAL DC2432B

QUICK START PROCEDURE

With the demonstration circuit, it is easy to set up and

evaluate the performance of the LT6658. Refer to Figure1

for proper measurement equipment setup and follow the

procedure below.

1. With the power off, connect the power supply positive

to VIN and the common to GND. With default settings,

the supply can range from VOUT + 2.5V to 36V.

2. Connect a DVM to the VOUT turret OUT1 with the com-

mon connection attached to ground.

3. Turn on power supply and confirm reference operation

on OUT1, and also OUT2.

JUMPER SUMMARY

JP1: VIN Input Selection. This jumper has 3 positions:

1. SEP:Separates the VIN from the VIN1 and VIN2 output

buffer supplies

2. COM/V2 : Shorts the VIN2 output buffer supply pin to VIN

3. COM/V1:Shorts the VIN1 output buffer supply pin to VIN

JP2: VIN1/VIN2 Output Buffer Supply Connection:

1. SEP:Separates the VIN1 and VIN2 output buffer supply

2. COM: Shorts the VIN1 and VIN2 output buffer supplies

Figure 1. Test Setup

DMM

A V COM

2.500V

POWER

SUPPLY

COM +

5.00V

DC2432B F01

2.5

dc2432bfb

DEMO MANUAL DC2432B

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

JP3: OD Output Disable:

1. ENA: Enables the outputs

2. DIS/EXT:Disables the outputs or allows the OD pin to

be driven externally.

JP4: Noise Reduction Select:

1. LF: 10μF

2. NF: Optional cap

3. HF: 0.1μF

JP5: OUT1 Select:

1. Fixed:OUT1 sense line is shorted to OUT1 Force and

the output is fixed.

2. ADJ:OUT1 sense line is separated from OUT1 Force

allowing for resistors R1 and R2 to be installed and

programming the OUT1 voltage to a different value.

JP6: OUT2 Select:

1. Fixed:OUT2 sense line is shorted to OUT2 Force and

the output is fixed.

2. ADJ:OUT2 sense line is separated from OUT2 Force

allowing for resistors R4 and R5 to be installed and

programming the OUT2 voltage to a different value.

OPTIONAL SETTINGS

1. Programming the Output Voltage

By separatingthe VOUT_S line fromthe VOUT_F and using

2resistors to create a divider in the feedback of the out-

put amplifier, the reference output can be programmed

from the nominal output voltage, up to 2.5V below the

supply voltage. The output voltage range is limited on

the high side due to internal ESD clamps that protect

the pins when the voltage goes above 6V. The output

voltage can be set using the equation:

VOUT = VREF • (R1 + R2)/R2 with VREF set by nominal

output voltage

QUICK START PROCEDURE

The resistors will affect the temperature drift and

accuracy of the LT6658 output, so care should be

given when choosing resistors. It is crucial that the

resistor ratio stay consistent over temperature to

guarantee the best reference performance.

2. Setting the Noise Reduction

Thenoise reductionpincanbe usedtofilterthe reference

output. The demo board comes with two pre-installed

capacitors that can be selected with the NR jumper.

The effects of the different capacitors are shown in

Figure2, and the 3dB frequencies produced by vari-

ous NR capacitors for each output voltage variant are

provided in Table 1.

Table 1. NR Capacitor Values and the Corresponding 3dB Frequency

Capacitor

(µF)

1.2V NR 3dB

Frequency

(Hz)

1.8V NR 3dB

Frequency

(Hz)

2.5V, 3V, 3.3V, 5V

NR 3dB Frequency

(Hz)

0.1 4145 4522 3979

0.22 1884 2055 1809

0.47 882 962 847

1 414 452 398

2.2 188 206 181

4.7 88 96 85

10 41 45 40

22 19 21 18

Figure 2. LT6658 Bandgap Output Voltage

Noise with Various NR Capacitor Values

= 0µF

= 1µF

= 10µF

FREQUENCY (kHz)

0.01

0.1

100

1000

100

150

200

250

NOISE (nV/√

)

DC2432B F02

dc2432bfb

DEMO MANUAL DC2432B

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0917 REV B • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstrationboard(DEMOBOARD)kitbeingsoldorprovidedbyLinearTechnologyisintendedfor use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC2432A

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